 <!DOCTYPE html>
 <html lang="en">
 <head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
 </head>
 <body>
    <script>
        // 用途定义私有属性
        const name = Symbol("name");
        const Student = {
            name:"张三",
            [name]:"狗蛋",
            age:10
        }
        console.log(Student);

        for (const key in Student) {
           
                const item = Student[key];
                console.log(item)
            
        }

       
     
        var keys = Object.getOwnPropertySymbols(Student)
        console.log(Student[keys[0]]);
    </script>
 </body>
 </html>